SDR UALA2013050203055

Service difficulty report · Wire · Boeing 747422

Difficulty date: April 30, 2013
Submitted: June 6, 2013
Operation: Air carrier
Aircraft: N104UA
Make and model: Boeing 747422
Aircraft serial: 26902
Aircraft time: 62,881 hours, 7,301 cycles
Engine: Pwa PW4056
System (JASC): 7597 · Engine Bleed Air System Wiring
Part: Wire
Condition: Failed
Location: Nr 1 Bleed Sys
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

NR 1 ENGINE BLEED MESSAGES. BLEED CONTROL VALVE SOLENOID WIRING FAILED (CH A) & STABILITY BLEED CONTROL VALVE SOLENOID WIRING FAILED (CH A). REPLACED BOTH RELAY VALVE AND SOLENOID VALVE IAW MM 75-32-04. IDLE RAN ENGINE, OPS CHECKED NORMAL.